docs: def get_comment(self, item):
          """
          Get the comment for the requested entry
          """
          key = item.upper()
          if key not in self._record_map:
              raise KeyError("unknown record: %s" % key)
  
          if 'comment' not in self._record_map[key]:
              return None
          else:
              return self._record_map[key]['comment']